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Exhibit 23

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following registration statements:

Form S-8 Registration Statement of Lincoln Electric Holdings, Inc. for the Stock Option Plan for Non-Employee Directors (Form S-8 No. 333-49976),

Form S-8 Registration Statement of Lincoln Electric Holdings, Inc. for the 1998 Stock Plan, including Post-Effective Amendment No. 1 (Form S-8 No. 333-58305),

Form S-8 Registration Statement of Lincoln Electric Holdings, Inc. for The Lincoln Electric Company Employee Savings Plan (Form S-8 Nos. 333-107114 and 333-132036),

Form S-8 Registration Statement of Lincoln Electric Holdings, Inc. (as successor to The Lincoln Electric Company) for The Lincoln Electric Company Employee Savings Plan, including Post-Effective Amendment No. 1 (Form S-8 No. 033-64187),

Form S-8 Registration Statement of Lincoln Electric Holdings, Inc. (as successor to The Lincoln Electric Company) for The Lincoln Electric Company 1988 Incentive Equity Plan (Form S-8 No. 033-25209), including Post-Effective Amendment No. 1 (Form S-8 No. 033-25210),

Form S-8 Registration Statement of Lincoln Electric Holdings, Inc. (as successor to The Lincoln Electric Company) for the 1995 Lincoln Stock Purchase Plan, including Post-Effective Amendment No. 1 (Form S-8 No. 033-64189),

Form S-8 Registration Statement of Lincoln Electric Holdings, Inc. for the 2006 Equity and Performance Incentive Plan (Form S-8 No. 333-134212), and

Form S-8 Registration Statement of Lincoln Electric Holdings, Inc. for the 2006 Stock Plan for Non-Employee Directors (Form S-8 No. 333-134210),

of our reports dated February 22, 2013, with respect to the consolidated financial statements and schedule of Lincoln Electric Holdings, Inc. and subsidiaries, and the effectiveness of internal control over financial reporting of Lincoln Electric Holdings, Inc. and subsidiaries, included in this Annual Report (Form 10-K) for the year ended December 31, 2012.

/s/ Ernst & Young LLP

Cleveland, Ohio

February 22, 2013

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Exhibit 23